如何更新使用MVC2 RC2

本文介绍了如何更新使用MVC2 RC2的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想编辑记录。我有缺省路由。结果当我点击提交按钮我上的UpdateModel线异常：结果类型'MyProject.Mvc.Models.Product'的模式无法更新。结果在页面ProductID字段的验证提示值无效：结果值9是无效的。 9是我试图编辑记录的ID。 什么地方出错了？

公众的ActionResult编辑（INT ID）{  产品产品= productRepository.GetProduct（ID）;  返回查看（新ProductFormViewModel（产品））;}[HttpPost]公众的ActionResult编辑（INT ID，的FormCollection productFormViewModel）{   产品产品= productRepository.GetProduct（ID）;   尝试   {     // TODO：添加更新逻辑这里     的UpdateModel（产品，产品）;     productRepository.Save（）;     返回RedirectToAction（「指数」）;   }   赶上（异常前）   {      返回查看（新ProductFormViewModel（产品））;   }}

如果我更新示范线更改为：

的UpdateModel（产品）;

则不会抛出异常，并且不更新数据库中的数据。

我使用实体框架

命名空间MyProject.Mvc.Models{  [MetadataType（typeof运算（ProductMetaData））]  公共部分类产品  {      公共产品（）      {          //初始化产品          this.CreateDate = System.DateTime.Now;      }  }  公共类ProductMetaData  {      [必需（的ErrorMessage =产品名称是必需）]      [StringLength（50的ErrorMessage =产品名称必须在50个字符）]      公共对象产品名称{搞定;组; }      [必需（的ErrorMessage =说明要求）]      公共对象描述{搞定;组; }  }  公共类ProductFormViewModel  {      公共产品产品{搞定;私人集; }      公共ProductFormViewModel（）      {          产品=新产品（）;      }      公共ProductFormViewModel（产品产品）      {          产品=产品;      }  }}

解决方案

你需要编辑的ID？如果ID是产品的PK在表那么它可能是一个具有约束力的问题。尝试

[MetadataType（typeof运算（ProductMetaData））][绑定（不包括=ID）]公共部分类产品{  公共产品（）  {      //初始化产品      this.CreateDate = System.DateTime.Now;  }}

I am trying to edit a record. I have the default route. When I click the submit button I get an exception on the UpdateModel line: The model of type 'MyProject.Mvc.Models.Product' could not be updated. On the page the validation of the ProductId field is prompting the value is invalid: The value '9' is invalid. 9 is the id of the record I am trying to edit. What could be wrong?

public ActionResult Edit(int id) { Product product = productRepository.GetProduct(id); return View(new ProductFormViewModel(product)); } [HttpPost] public ActionResult Edit(int id, FormCollection productFormViewModel) { Product product = productRepository.GetProduct(id); try { // TODO: Add update logic here UpdateModel(product, "Product"); productRepository.Save(); return RedirectToAction("Index"); } catch (Exception ex) { return View(new ProductFormViewModel(product)); } }

If I change the update model line to:

UpdateModel(product);

then no exception is thrown and the data is not updated in the database.

[Edit]

I am using Entity Framework

namespace MyProject.Mvc.Models { [MetadataType(typeof(ProductMetaData))] public partial class Product { public Product() { // Initialize Product this.CreateDate = System.DateTime.Now; } } public class ProductMetaData { [Required(ErrorMessage = "Product name is required")] [StringLength(50, ErrorMessage = "Product name must be under 50 characters")] public object ProductName { get; set; } [Required(ErrorMessage = "Description is required")] public object Description { get; set; } } public class ProductFormViewModel { public Product Product { get; private set; } public ProductFormViewModel() { Product = new Product(); } public ProductFormViewModel(Product product) { Product = product; } } }

解决方案

Do you need to edit the ID? if the ID is the PK of the product in your table then it could be a binding issue. Try

[MetadataType(typeof(ProductMetaData))] [Bind(Exclude="ID")] public partial class Product { public Product() { // Initialize Product this.CreateDate = System.DateTime.Now; } }